The trains will initially run on narrow-gauge heritage routes operated by the Kalka-Shimla Railway, the Darjeeling Himalayan Railway, the Nilgiri Mountain Railway, the Matheran Hill Railway, and others.
The hydrogen-powered trains have a "range of 1,000 kilometres", can clock a top speed of "140 kph" and are "emission free in operation", French company Alstom, which manufactured the trains, has said